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Author: search.filters.author.Duangthong, ChatupornSubject: search.filters.subject.LDPC code

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    Development of High Efficient LDPC Encoder for Deep Space Applications
    (2023-01-01)
    Srisupha, Thanat
    ;
    Wongsa, Anusorn
    ;
    Duangthong, Chatuporn
    ;
    Phakphisut, Watid
    In this paper, we present the design and implementation of a high efficient low-density parity-check (LDPC) encoder for deep space applications. The proposed encoder utilizes the generator matrix of CCSDS LDPC codes to simplify the encoding process and reduces the complexity of hardware implementation. The proposed encoder has two types. The first type aims to design a low-complexity architecture and flexibility. The second type presents high throughput architecture, allowing the user to choose the appropriate type according to their usage condition. The results of FPGA synthesis show that the proposed LDPC encoders achieve flexibility, low complexity, and high throughput.
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    Read Voltage Optimization in MLC NAND Flash Memory via the Density Evolution
    (2019-04-01)
    Duangthong, Chatuporn
    ;
    Phakphisut, Watid
    ;
    Supnithi, Pornchai
    The multi-level-cell (MLC) NAND flash memory can typically use multiple reads for obtaining soft information for the LDPC decoder. The multiple reads give the soft information which is quantized to a certain level. The major challenge is that the read voltages must be precisely selected to provide better soft information. In the previous work, the read voltages are selected so that the soft information has the maximum mutual information (MMI). However, the error-correction capability of LDPC decoder is not considered. Therefore, in this work, we analyze the performance of LDPC decoder by density evolution whereby the soft information is quantized. Then the optimal read voltages for given LDPC codes are obtained. As a result, for a regular LDPC code with the read voltages optimized by density evolution can provide the lower BER performance compared with the MMI technique.